Automatic reverse ratcheting hoist



June 7, 1932.

F. W. COFFLNG AUTOMATIC REVERSE RATCHETING HOIST Filed Sept. 3, 1929 2Sheets-Sheet l INVENTOR. F/tzf'DR/CK m Cor-nus.

A TTORNEYS.

June 7, 1932. F. w COFFING AUTOMATIC REVERSE RATCHETING HOIST FiledSept. 5, 1929 2 Sheets-Sheet INVENTOR. FkflJ/il [K (OFF/N6,

A TTORNEYJ- Patented June 7, 1932 UNITED STATES FREDRICK W. GOFFING, OFPERRYSVILLE, INDIANA AUTOMATIC REVERSE v RATCHETING HOIST Applicationfiled September 3, 1929. Serial No. 389,956.

sociated with a load supporting chain and the actuating and lockingmeans for said sprocket which permits the chain to advance or retirestep by step, or permits the free movement of the chain for a quick andapproximate positioning when there is but little or no weight on thechain.

Another feature'of the invention consists go in the automatic step bystep load lowering movement of the hoist if the load is not excessiveand the hoist is conditioned for reversing or lowering movement.

A third feature of the invention consists in providing parts of themechanism in duplicate such that the actuating handle or lever may bepositioned at either side and function satisfactorily, said lever forsafety purposes being prevented from complete rotation by a suitablestop. A fourth feature of the invention consists in an improved stop forthe chain and the method of making and mounting same.

The full nature of the invention will be 36 understood from theaccompanying drawings and the following description and claims:

In the drawings Fig. 1 is an elevational view of the sprocket, chain andhalf of the housing included in the hoist. Fig. 2 is an elevational viewof the locking or control portion of the hoist with the actuating leverand associated mechanism removed. Fig. 3 is an elevational view similarto Fig. 1 showing the main locking pawl in neutral or free chainposition. Fig. 4 is a view similar to gential to the sprocket so thatthe load is Fig. 2 but with the parts in another position. Fig. 5 is asectional view of the hoist taken on line 55 of Fig. 1 and in thedirection of the arrows. Fig. 6 is an elevational view of the rear ofthe lever handle and lever supported mechanism. Fig. 7 is a transversesection thru the stop and end link of the chain. Fig. 8 is a plan Viewof the stork in the process of forming the stop.

Fig. 9 is a perspective View of the eccentric shaft.

Fig. 10 is a sectional View taken on line 1010 of Fig. 5, with partsshown in ele-' vation, to show pin 59 of the pawl 31 engaging thesurface of one cam pawl 54., and associated parts.

In the drawings 10 indicates the bodyportion of the hoist which isformed of two substantially similar but complementary, preferablymalleable iron, half portions, secured together as by riveting or thelike. The housing or body portion thus formed includes two inclinedchannels 11 and 12 which simultaneously communicate with each other andchamber 13. Pivotally mounted in the bearings 14 and 15 in the housingis a spindle 16 which extends through the body housing and mounts inchamber 13 an integral sprocket gear 17, the teeth of which project intothe channels at the meeting location and mesh with the links 18 of theload supporting chain. positioned in said channels.

A stop 19 at one end of the chain prevents complete withdrawal of thechain through the hoist by preventing a sprocket tooth from seating inthe link space occupied by the stop. The other end of the chain isprovided with a suitable load supporting link, hook or the like. Thehousing 10 swivelably supports at 21 a similar anchoring hook 2Oopposite therefrom.

The channel 12 and swivel axis of hook 20 are in longitudinal alignmentand are tantaken by the sprocket as a tangential load and is in linewith the two hooks.

In chamber 13 there is pivotally mounted a locking pawl 23. Shaft 22which supports said pawl extends through the body wall 10 and projectsinto the lever handle housing 7. The pawl 23 is maintained in lookingposition to prevent lowering of the weight and the chain by a multiplespring including a coiled spring 24 having one end connected to the pawland its other end connected to a flat spring 25 which in turn has itsother end socured to the frame 10 by rivet 125. The load is elevated bythe clock-wise rotation, reference being had to Figs. 1 and 3 ofsprocket pinion 17 through the lever handle 29, hereinafter to bedescribed, which raises the chain 18 and elevates the load. In thismovement the pawl 23 automatically ratchets over and seats itself behindeach successively presented sprocket tooth to prevent reverse movementof the sprocket while the actuating portion including the lever handleis being reversed for further rotation.

The mounting of the lever handle 29 is shown particularly in Fig. -.5and the lever handle itself is shown in Fig. 6. The spindle 16 inaddition to being provided with a sprocket gear includes an integralground cylindrical portion 27 having ratchet teeth 28 cut therein, thecylindrical portion being rotatably supported in the bearing 15. Asmaller cylindrical portion 9 is receivable by a cylindrical portion 8of the housing portion 7 of the handle which is provided with theelongated extension or handle portion 29.

A washer 66 and a'bolt 67 are mounted by threading the latter into thethreaded portion of chamber 68, the latter having an outlet 168 forlubrication, which is supplied thereto by removing the bolt 67 fillingchamber 68 with cup grease and replacing bolt 67.

Pivotally supported at 30 on the handle is a pawl 31 which mounts a pin59 that is an actuating member and also serves as a stop or anchoragefor a spring 32. The other end of the spring engaging a wall portion 7of the handle, and the spring 32 is coiled about the pivot 30. The pawl31 includes an angular flat spring extension 34 which is apertured as at36 to receive the off-set end of a rod 35. Rod 35 is reciprocated by afinger lever 37 pivotally supported adjacent the end of the handle leverin the ears 40. Lever 37 includes an arm 39 which is associated with theangular end 38 of the rod so that when the member 37 is depressed towardthe handle, the rod 35 will be projected toward bearing 8, whereupon theoff-set portion at the end of the rod 35 adjacent the spring aperture 36will bend the spring before tilting occurs of the pawl 31counter-clockwise or radially outward from the ratchet teeth 28,provided there is load upon said pawl. Therefore this arrangementprevents dropping of load so that the handle control is fool-proof. Ifno load is on the ratchet, then pawl 31 is relieved from it by theactuation of rod 35 since spring 34 is slightly stronger than spring 32.It is to be remembered, however, that movement of the pawl 31 also movestheactuating pin 59 and reference thereto will be made later.

By referring to Figs. 2 and 4 it will be noted that the top plate 48includes an abutment, face or ledge 56 and substantially oppositetherefrom there is pivotally supported (by the so-called reversing ringconstruction) as at 52 a cam pawl having the camming portion 54 and therear face 50, said pawl being normally projected outwardly, that is withits face 50 extended beyond the plate as shown in Fig. 4 and by means ofthe fiat spring 49. The pin 59 carried by the handle pawl 31, see Fig.6, is adapted to either engage the flat face 50 of the pawl, or

the face 56 of ring 48 for clockwise movement of the reversing. ringconstruction, reference being had to Figs. 2 and 4, which iscounterclockwise rotation with reference to Figs. 1

and 3.

the sprocket and the load is carried by the,

handle through the ratchet and is elevated in the rotation of theratchet and sprocket by the chain.

The handle as shown in Fig. 6 is provided with an opening 100 so that itmay be hung upon a linemans belt and the like since this puller-hoistweighs in the neighborhood of from 12 to 25 pounds. The opening 100,Fig. 6, also may receive a wire or rope for actuating the handle at adistance, i. e." from the cross arm to the ground. The handle may bepositioned for oscillating movement upon either side of the longitudinalplane through the chain and hooks. The handle will operate just aseffectively when positioned upon either side. Stop 33 tion of thehandle.

The locking pawl shaft 22 extends into the handle chamber and supportsan angularly extending arm 26, see Figs. 2 and 4, which has associatedtherewith a spring 47, the other end of which is secured to thereversing ring construction as at 46, see Figs. 2 and 4. Upon theopposite side of the housing from that mounting the handle thereprojects a shaft 101 and carried thereby is a finger prevents completerotais maintained in that position by the flat spring 25 hearing againstthe fiat face 63 or 65 thereof. In this construction spring 25 thereforehas an additional function. The portion of the rock shaft 101 which isextended into the chamber formed by the handle has an eccentric pinhaving a flatface 142 and an arcuate periphery 42 completing the same,and the aforesaid is operatively associated with the reversing ringconstruction as hereinafter set forth.

The shoulder 114 on shaft 16 adjacent bearing. 14 prevents shaftmovement toward that hearing. The flange 115 adjacent hearing 15prevents movement in the opposite direction. The elongated spindleportion 9 prevents cooking of the handle 29 since the same is providedwith the elongated bearing 8 cooperating therewith.

Reversing ring construction In addition to the features of constructionspecifically pointed out hereinbefore, the

present invention includes a so-called reversing ring construction whichembodies the chief features of the invention.

The outer plate 48 of said construction is secured in spaced relation tothe inner plate 148, see Fig. 5, and said plates are of general ringoutline. The ring construction is looked upon the elongated sleeveportion 15 by the split locking ring 62 seatable in the groove 116 insaid sleeve bearing.

Plate 48 includes a projecting tooth 56 having an inclined face 156.Opposite therefrom and pivotally supported at 52 between plates 48 and148 is a so-called shedding pawl having the substantially radial face 51and the cam point 54. A flat spring 49 normally projects the face 51beyond the periphery Of plate 48, see Fig. 4. Suitably mounted upon thehousing is a stationary stop and cam 55 4 that also serves as ananchorage for spring 45.

"When the ring construction is rotated clockwise, see Fig. 4, the point54 of the pawl rides upon the cam 55 and the radial face 51 is retractedbehind the periphery of plate 48 and this is in opposition to spring 49.

The inner plate 148 has a notch formed therein, one edge of which,adjacent the cam pawl 54, includes an edge 248 that may engage the stopand combination cam 55 when clockwise movement of the ring is sufiicientin that direction.

The opposite edge of the notch thus formed is indicated at 348 and isengageable by the eccentric pin carried by shaft 101 and having anarcuate face 42 anda flat face 142, see Figs. 2 and 4. Shaft 101 alsohas the two fiat cam faces 63 and 65, see Figs.

1 and 3. Shaft .101 is oscillatableiby the handle or finger piece 44,see Figs. 1 and 3. When face 42 of the pin carried by the shaft 101engages edge 348 the reverse ring is retarded clockwise, compare Figs. 2and 4, which transforms the device into the customary unidirectionalratcheting tool, see Fig. 2.

The two plates 48 and 148 also support a pin 41, the same beingpositioned almost diametrically "opposite pivot 52 and upon which theshedding pawl is mounted. The

lateral arm 26 carried by the shaft 22 (in turn carrying the lockingpawl 23) engages the pin 41. Rotation of shaft 101 by lever or fingerpiece 44 positions the reversing ring in advanced position, as shown inFig. 4, or in retarded position, as shown in Fig. 2 depending upon thedirection of rotation. Both springs 45 tend to rotate the ringconstruction into advanced position. Spring 47 assists such tendency.The spring 24 opposes springs 45 and 47. All of the aforesaid springsare .operatively connected through the shaft 22 and arm 26. Spring 47 isso arranged and mounted that until required for operation it may beconsidered as entirely inoperative for the tension is imparted to itwhen required by rotation of the/reverse ring through the eccentric pin42 or the pin 59 in the pawl 31. Springs 47 and 24 are both effective inthe same direction so far as their efiect on pawl 23 and arm 26 isconcerned.

The face 56 of the plate 48 and the face 50 of the pawl 51 arediametrically positioned and either may be engaged by the pin member 59carried by the lever supported pawl "31, see Fig. 6. Thus the handle innormal operation may be positioned upon either side of the stop 33 uponthe housing and satisfactorily operate at either'side and withoutcomplete rotation of the handle so that complete swinging of the handlecannot take place.

Operation In the rotation of the lever handle 29 to I elevate the loadthe cam face 65 must engage spring 25. The load sustaining pawl 23oscillates into and out of tooth locking position while the load iscarried by the spindle" and by the handle through the pawl 31 engagingin the ratchet teeth 28. Upon reverse handle movement spring 24 causesthe 1 In reversing to lower the load cam face 63 of shaft 101 bears onthe flat spring 25 which advances cam 42, see Fig. 4, and releasestension on springs45.

. For reversal of the chain through the hoist when there is no loadthereon, the lever 44 is turned so that cam 63 engages flat spring 1 25,see Fig. 3. This moves the eccentric cam pin 42-142 into position sothat the reverse ring construction is advanced anti-clockwise by springs45 and 47 which forces the cam pin 41 to tilt the arm 26. This tiltinglifts the pawl 23 out of pinion tooth engagement. W hen latch 37 onhandle 29 is depressed, pawl 31 will be disengaged from ratchet 28. Thechain may then be pulled into the lowered position. The chain with noload upon it also may be freely pulled through the device to shorten theeffective chain length so that so-called free chain movement in bothdirections is thus possible.

Tf there is any material tension or load on the chain the draft insprocket tooth 17, see Fig. 1, will not permit locking pawl 23 torelease or tilt from looking position without first advancing thesprocket 17 clockwise, see Fig. 1, sufficient for the pawl 23 to passout of the tooth pocket. lVhen there is a load on the chain and it isdesired to lower the load, lever 44 islturned to position the cam face63 against spring 25 which advances cam 42, see Fig. 4.

Whenever lever 44 is turned up, see Fig. 1, the reverse ring is retardedinto so-called neutral position Whenever the lever 44 is turned down,see Fig. 3, the pin.42142 is neutral and the reverse ring is effectivefor reversal.

The hand lever 29 is turned anti-clockwise until the load is takenthereby which thereupon permits springs 45 and 47 to advance the reversering and cam pin 41 to engage arm 26 and thus tilt pawl 23 out oflocking and load sustaining position. Reverse movement of lever 29causes pin 59, see Fig. 6, to

engage face 56 of plate 48 or the shedding pawl face 50 and causesreverse ring movement. When this occurs cam pin 41 is released fromengagementwith the arm 26 and spring 47, carried by the ring, and spring24 tilts arm 26 and pulls locking pawl 23 into tooth locking position totake the load. Thereupon the handle supported driving pawl 31 may bereleased from ratchet 28. Springs 45 and spring 47 pull face 56 or face50 of the shedding pawl 51 against the actuating'pin 59 depending uponwhich side of the hoist the handle 29 is positioned.

This spring movement of the ring lifts pawl 31 from ratchet 28sufficient to just clear the ratchet tooth. Lowering of the leverhandlecounter clockwise permits pin 59 to leave plate face 56 or pawlface 50, and spring 32 seats the pawl 31 in the next adjacent ratchettooth 28. By this movement only one ratchet tooth distance advance ispossible in lowering under load, and so-called dropping of the load isprevented. Movement of the reverse ring by engagement of either plateface 56 on shedding pawl 51 causes the aecaeaa shedding pawl portion 54to engage the face of abutment 55 carried by the housing. The action ineither event subsequent there to is the same as previously set forth.

The operation of the device for convenience has been described as forraising and lowering but applies as well to pulling and slacking offpurposes and the terminology in the claims is to be thus interpreted.

In Figs. 5, 7 and 8 an improved chain stop is illustrated. Herein thesame includes a stop block 80 having a semicircular recess 81 in one endand of a large diameter and a similar but smaller recess 82 at theopposite end. These stops, see Fig. 8 are formed from bar stock, withalternate holes of different diameters formed therein and thence severedtransversely through the holes as shown;

The holes may be formed by drilling or punching. The severance may be bysawing or shearing. v

The larger recess 81 embraces the pintle supported spacer or roller 83while the smaller recess 82 embraces the pintle 84. The links areindicated at 85. The end link includes a standard detaching lockingarrangement called a master link instead of having its pintles upset asindicated on the drawings for the other links. The end pintles aresuitably fashioned to detachably receive the yielding locking member 86which may be forcibly removed therefrom.

The aforesaid construction permits standard lengths of chain to'beconnected in the usual manner and the stop member 82 removed andreplaced in the endmost link of the connected chain lengths.

The invention claimed is:

1. In a free chain hoist the combination of a load sustaining sprocket,a spindle sup' porting the same, a body supporting said spindle andincluding a chain passage into which said sprocket projects, a sprocketchain in said passage and engageable by the teeth of the sprocket, aload sustaining pawl pivotally supported by the body and normallypreventing return rotation of the sprocket, an operating lever handle, aratchet engaging pawl supported by said handle and movable therewith, aratchet secured to said spindle for rotating the same and said sprocketthrough said second mentioned pawl for moving the chain in onedirection, said chain being free running in said direction, and meansco-acting with the ratchet engageable pawl and the sprocket engageablepawl for automatically releasing the same for step by step reversemovement of the chain.

2. In a free chain hoist the combination of a load sustainin sprocket, aspindle supporting the same, a body supporting said spindle andincluding a chain passage into which said sprocket projects, a sprocketchain in said passage and engageable by the teeth of the.

sprocket, a load sustaining p awl pivo'tally ating lever supported bythe body and normally preventing return rotation of the sprocket, anoperhandle, a ratchet engaging pawl supported by said handle and movabletherewith, a ratchet secured to said spindle for rotating the same andsaid sprocket through said second mentioned pawl for moving the chain inone direction, said chain being free running in said direction, andmeans co-acting with the ratchet engageable pawl and the sprocketengageable pawl for automatically ating lever handle, a ratchet engagingpawl releasing the same for step by step reverse movement ofthe chain,said means being arranged for automatic actuation by the weight of thehandle when not more than a predetermined weight including the weight ofthe chain is supported by the sprocket.

3. In a free chain hoist the combination of a load sustaining sprocket,a spindle supporting the same, a body supporting said spindle andincluding a chain passage into which said sprocket projects, a sprocketchain in said passage and engageable by the teeth of the sprocket, aload sustaining pawl pivotally supported by the body and normallypreventing return rotation of the sprocket, an opersupportedcby saidhandle and movable therewith, a ratchet secured to said spindle forrotating the same and said sprocket through said second mentioned pawlfor moving the chain in one direction, said chain being free running insaid direction, means co-a-cting with the ratchet engageable pawl andthe sprocket engageable pawl for automatically releasing the same forstep by step reverse movement of the chain, and means carried by thebody preventing complete rotation of the lever handle.

4. In a free chain hoist thecombination of a load sustaining sprocket, aspindle supporting the same, a body supporting said spindle andincluding a chain passage into which said sprocket projects, a sprocketchain in said passage and engageable by the teeth of the sprocket, aload sustaining pawl pivotally supported by the body and normallypreventing return rotation of the sprocket, an operating lever handle, aratchet engaging pawl supported by said handle and movable therewith, aratchet secured to said spindle for rotating the same and said sprocketthrough said second mentioned pawl for moving the chain in onedirection, said chain being free running in said direction, meansalternately co-acting with the ratchet engageable pawl and the sprocketengageable pawl for automatically releasing the same for step by stepreverse movement of the chain, and means carried by the body preventingcomplete rotation of the lever handle, said alternately co-acting meansbeing arranged for opposite positioning of the handle and permittingoscillation thereof through an arc of less than 180 degrees.

5. In a free chain hoist the combination of a load sustaining sprocket,a spindle supporting the same, a body supporting said spindle andincluding a chain passage into which said sprocket projects, a sprocketchainin said passage and engageablc by the teeth of thesprocket, a loadsustaining pawl pivotally supported by the body and normallypreventingreturn rotation of the sprocket. an operating lever handle, a ratchetengaging pawl supported by said handle and movable therewith, a ratchetsecured to said spindle for rotating the same and said sprocket throughsaid second mentioned pawl for moving the chain in one direction, saidchain being free running in said direction, and means co-acting with theratchet engageable pawl and the sprocket engageable pawl forautomatically releasing the same for step by step reverse movement ofthe chain. said co-acting means associated with the ratchet engageablepawl and the sprocket enga geable p'awl being arranged for positioningfor maintaining both in non-operative position when there is no load onthe chain for free running of the chain in the reverse direction.

6. In a free chain hoist the combination of a sprocket, a spindlesupporting the same, a

body supporting said spindle and including in one direction, meansassociated with the load sustaining pawl for permitting free runmng ofthe chain in this direction, means coacting with the ratchet engagingpawl and the sprocket engaging pawl for automatically releasing the samefor step bystep reverse movement of the chain, and means cooperatingwith the sprocket engageable pawl for normally maintaining the same innonsprocket engaging position for permitting free running of the chainin the reverse direction, said means upon the application of apredetermined load being arranged to automatically lock the chainagainst free running in said reverse direction.

I 7. In a chain hoist the combination of a rotatably supported spindle,a sprocket rigid therewith, a ratchet also rigid therewith, an actuatingpawl engaging said ratchet, a load sustaining pawl engaging saidsprocket, a ring having limited rotary movement relative to the spindle,and means associated with the ring and cooperating with the ratchetengageable pawl to permit predetermined operation of the sprocket.

'8. In a chain hoist the combination of a rotatably supported spindle, asprocket rigid therewith, a ratchet also rigid therewith, an actuatingpawl associated with said ratchet, a load sustaining pawl associatedwith said sprocket, a ring having limited rotary movementrelative to thespindle, a locking arrangement for said ring, and means associated withthe ring co-acting with said pawls for automatically disengaging thering from locking engagement and permitting predetermined reversal ofthe sprocket.

9. In a chain hoist the combination of a ro tatably supported spindle, asprocket rigid therewith, a ratchet also rigid therewith, an actuatingpawl associated with said ratchet, a load sustaining pawl associatedwith said sprocket, a ring having limited rotary movement relative tothe spindle, a locking arrangement for said ring, means associated withthe ring co-acting with said pawls for automatically disengaging thering from locking engagement and permitting predetermined reversal ofthe sprocket, and other means associated with said ring forintermittently actuating the same and returning the ring to initialposition for subsequent operation and insuring step by step reversemovement of the sprocket.

10. In a chain hoist the combination of a housing having a support atone end and a chain channel at the opposite end and in substantialalignment with the axis of the support, said housing having an angularlydirected extension channel communicating with the inner end of the firstmentioned ch annel. a chain positionable in said channels, a sprocketchamber in said housing, a sprocket in' the chamber, said sprocket beingmounted such that the teeth thereof have engagement with said chain atthe meeting of the channels whereby a tooth in each channel is in chainengagement and at least two teeth of the sprocket are always in chainengagement.

11. In a chain hoist the combination of a housing having a support atone end and a chain channel at the opposite end and in substantialalignment with the axis of the support, said housing having an angularlydirected extension channel communicating with the inner end of the firstmentioned channel, a chain positionable in said channels, a sprocketchamber in said housing; a sprocket in the chamber, said sprocket beingmounted such that the teeth thereof have engagement with said. chain atthe meeting of the channels whereby a tooth in each channel is in chainengagement and at least two teeth of the sprocket are always in chainengagement, a load sustaining pawl operatively associated with saidsprocket, and means normally constraining said pawl toward sprocketengagement, said pawl having a predetermined draft for the purposedescribed.

12. In a chain hoist the combination of a housing having a support. atone end and a chain channel at the opposite end and in substantialalignment. with the axis of the support, said housing having anangularly directed extension channel communicating with the inner end ofthe first mentioned channel, a chain positionable in said channels, asprocket chamber in said housing, a sprocket in the chamber, saidsprocket belng mounted such that the teeth thereof have engagement withsaid chain at the meeting of the channels whereby a tooth in eachchannel is in chain engagement, a load sustaining pawl operativelyassociated with said sprocket, means normally constraining said pawltoward sprocket engagement, said constraining means including a coilspring arcuately associated with said pawl and a flat spring connectedthereto, and a control member engageable by said flat spring andnormally retained in predetermined position thereby but permittingforcible movement therefrom.

13. In a chain hoist the combination of a housing having a support atone end and a chain channel at the opposite end and in sub stantialalignment with'the axis of the support, said housing having an angularlydirected extension channel communicating with the inner end of the firstmentioned channel, a chain positionable in said channels, a sprocketchamber in said housing, a sprocket in the chamber, said sprocket bemgmounted such that the teeth thereof have engagement with said chain atthe meeting of the channels whereby a tooth in each channel is in chainengagement, a load sustaining pawl operatively associated with saidsprocket,

means normally constraining said pawl toward sprocket engagement, saidconstraining means including a coil spring arcuately associated withsaid pawl and a flat spring connected thereto, a control memberengageable by said fiat spring and normally retained in predeterminedposition thereby but permitting forcible movement therefrom, and a leverassociated with said last mentioned member, the same having a pluralityof flat faces each for selective engagement with said flat spring.

.14. In a free chain hoist the combination with a load sustainingsprocket, a load sustaining pawl operatively associated therewith, asprocket actuating ratchet, a ratchet engaging pawl, a handle mountingsaid ratchet engaging pawl, of a reverse ring construction includingspring means normally constraining the ring toward one position, aneccentric member for permitting ring positioning in either of twopositions depending upon the positioning of said member, an armassociated with the load sustaining awl, and an actuating memberassociated wit the ratchet actuating pawl for predetermined ringmovement and pawl control.

15. In a free chain hoist the combination with a load sustainingsprocket, a load sustaining pawl operatively associated therewith, asprocket actuating ratchet, a ratchet engaging pawl, and a handlemounting said ratchet engaging pawl, of a reverse ring constructionincluding a radial projection op-. eratively associated with saidratchet engageable pawl for ring movement therewith, means pivotallymounting said ring construction, and a cam engageable by the ringconstruction in the rotation of the ring for predetermined movementthereof.

In witness whereof, I have hereunto affixed my signature.

FREDRICK Wu COFFING.

